Kokchin-Trias Fm
Period:
Triassic
Age Interval:
Upper Triassic (?), U5
Province:
Ustyurt-Sultanuzdag
Type Locality and Naming
Along the Kokcha River, east of the Sultanuizdag Mountains, South Pre-Aral. S.S. Shul'ts (Jr.), 1967 (509, p. 12). Stratotype not specified. The name has been preempted.
Synonym: Kokchin Suite, Кокчинская св.
Lithology and Thickness
Grayish-purple sandstones, siltstone (aleurolites), feldspar-quartz, polymictic, with calcareous, clayey, and sericite-siliceous matrix, slate-like siliceous shales, clayey argillites. Thickness up to 150 m.
Lithology Pattern:
Fine-grained sandstone
Relationships and Distribution
Lower contact
Unconformably overlies the Paleozoic
Upper contact
It is overlain by the Sultanbobin Fm
Regional extent
Correlated with the lower part of the Chashkakul Gr (Northern Aral Region) (446).
GeoJSON
null
Fossils
Age
Upper Triassic (?). For lexicon put as Base Norian?. The Late Triassic (?) age assignment is provisional, based on correlation with the lower part of the Chashkakul Gr (Northern Aral Region) (446).
Age Span:
Beginning stage:
Norian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
227.30
Ending stage:
Rhaetian
Fraction up in the ending stage:
1.0
Ending date (Ma):
201.36
Depositional setting
Represent shallow-water, possibly lagoonal or lacustrine facies.
Depositional pattern:
Additional Information
Compiler:
V. V. Kurbatov – In: GeoGPT translation of: “Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian)”